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20 - 32 + 15 - 18 + 4
20 + 15 + 4 - 32 - 18
39 - 50
- 11
Solución :
- 11
(+)(-) = -
(-)(-) = +
(+)(+) = +
entonces:
20 - 32 +15 - 18 + 4 --> sumas numeros con el mismo signo, restas si son diferentes
20+15+4 -32-18
39 - 50
-11
El signo se adopta del numero mayor